package com.example.netty.udp.client;

import java.net.InetSocketAddress;
import java.nio.charset.Charset;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.socket.DatagramPacket;

public class UDPClientHandler extends SimpleChannelInboundHandler<DatagramPacket>{

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, DatagramPacket msg)
            throws Exception {
        ByteBuf buf = msg.content();
        int len = buf.readableBytes();
        byte[] data = new byte[len];
        buf.readBytes(data);
        String receive = new String(data,"UTF-8");
        System.out.println("client->"+receive);
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        ctx.writeAndFlush(new DatagramPacket(Unpooled.copiedBuffer("hello,server",Charset.forName("UTF-8")),
                new InetSocketAddress("127.0.0.1", 12345)));
    }

}